Ok, I'm new to this forum, I have no clue what i'm doing. lets start there.
I got a TI nspire cx cas a while back and recently learned about endless. the problem is that i haven't updated my calc so it is currently at 3.2, and since the most recent os is 3.9 I dont know where to get the os or how to upload it. school starts in a week for me so I would like to finish this soon.

Yeah but im trying to get 3.6

Well, first of all, try to avoid double-posting. You can use the modify button at the top left of your post to edit them.

Before you update, please think very carefully about the following things (I don't own an nspire, so this may be inaccurate and I may have forgotten a few things):
    - Installing OS 3.6 means that you will never be able to install OS 3.2 again, or any OS below 3.6.
    - OS 3.6 introduces some new bugs that may annoy you.
    - OS 3.6 uses a different version of ndless (ndless 3.6 instead of ndless 3.2), so some programs and games may not be compatible.
So if you're not 100% sure, be sure to at least try it in an emulator for some time, and make sure to do everything you'd normally do on that emulator in the new OS.

If, after all that, you are still sure you want to update your nspire, you can find the download links here.

OS 3.6 is most likely no longer linked on TI website, if it's even on their servers anymore at all, but TI-Planet usually keeps track of OS URLs or if it's no longer available they keep copies intact. It's currently reachable via http://tiplanet.org/forum/archives_voir.php?id=29554 for the time being.

If you can manage to downgrade to OS 3.1, I would recommend it because it's smaller and has less bugs, but Lua is much slower and some Lua programs won't run. OS 3.1 and 3.6 are the ones that supports Ndless so make sure you don't upgrade to 3.9.

Indeed, because most new versions barely even had anything new, yet still jumped very high in OS number. Some had notable improvements, such as OS 3.2, but other than that, not that much.